1/*
2 * Copyright (c) 2007,2011,2013 Apple Inc. All Rights Reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24//
25// reqreader - Requirement language (exprOp) reader/scanner
26//
27#ifndef _H_REQREADER
28#define _H_REQREADER
29
30#include <security_codesigning/requirement.h>
31#include <Security/SecCertificate.h>
32
33namespace Security {
34namespace CodeSigning {
35
36
37//
38// The Reader class provides structured access to a opExpr-type code requirement.
39//
40class Requirement::Reader {
41public:
42	Reader(const Requirement *req);
43
44	const Requirement *requirement() const { return mReq; }
45
46	template <class T> T get();
47	void getData(const void *&data, size_t &length);
48
49	std::string getString();
50	const unsigned char *getHash();
51	const unsigned char *getSHA1();
52
53	template <class T> void getData(T *&data, size_t &length)
54	{ return getData(reinterpret_cast<const void *&>(data), length); }
55
56protected:
57	void checkSize(size_t length)
58	{
59		if (mPC + length < mPC || mPC + length > mReq->length())
60			MacOSError::throwMe(errSecCSReqInvalid);
61	}
62
63	void skip(size_t length);
64
65	Offset pc() const { return mPC; }
66	bool atEnd() const { return mPC >= mReq->length(); }
67
68private:
69	const Requirement * const mReq;
70	Offset mPC;
71};
72
73template <class T>
74T Requirement::Reader::get()
75{
76	checkSize(sizeof(T));
77	const Endian<const T> *value = mReq->at<Endian<const T> >(mPC);
78	mPC += sizeof(T);
79	return *value;
80}
81
82
83}	// CodeSigning
84}	// Security
85
86#endif //_H_REQREADER
87